Granted Patent
Utility
US 4,407,941 · App. 06/355,464
Photographic element with pyrazole electron donors
Inventors:
Shunji Suginaka, Ryuichiro Kobayashi, Satoru Ikeuchi, Noboru Mizukura, Noriko Fujita
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Mar 8, 1982
Inventors
Shunji Suginaka
Ryuichiro Kobayashi
Satoru Ikeuchi
Noboru Mizukura
Noriko Fujita
Assignee (at issue)
Konishiroku Photo Industry Co., Ltd.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.